When carrying out an experiment, a student should reduce the uncertainty in every measurement as much as possible. In which situation is the student lowering the systematic error in a measurement?
- Aadjusting a voltmeter needle pointer to the zero position before using it to measure a potential difference
- Bmeasuring the diameter of a wire at several points and orientations
- Cmeasuring the mass of $100$ paperclips to determine the mass of one paperclip
- Dtiming $20$ oscillations of a mass on a spring to determine the period of one oscillation